One of the best features of keeping a TiddlyWiki with you on any system—such as a GTD TiddlyWiki—is the ability to throw into it anything you come across, whether it's a task to do or a note about dinner. Now you can add organized, easily-imported contacts to that list through twab, a macro that plugs into any Tiddly-type page and can take in contacts from Google, Yahoo, Outlook, and MSN, as well as any others that export into Comma-Separated Value (CSV) format. The tabbed address book comes in a plain gray/dark-gray scheme, but changing those colors—and many more things about twab—is explained at the link below.